IEC 61755-3-6:2006+A1:2012 defines dimensional limits and material properties of a 2,5 mm and a 1,25 mm diameter cylindrical composite ferrule optical interface to meet specific requirements for APC fibre-to-fibre interconnection. THIS CONSOLIDATED VERSION CONSISTS OF THE FIRST EDITION (2006) AND ITS AMENDMENT 1 (2012). THEREFORE, NO NEED TO ORDER AMENDMENT IN ADDITION TO THIS PUBLICATION.